21024444012 has 384 divisors, whose sum is σ = 62183116800. Its totient is φ = 5440512000.

The previous prime is 21024444011. The next prime is 21024444047. The reversal of 21024444012 is 21044442012.

It is a super-2 number, since 2×21024444012² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21024444011) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 208162762 + ... + 208162862.

It is an arithmetic number, because the mean of its divisors is an integer number (161935200).

Almost surely, 2^21024444012 is an apocalyptic number.

21024444012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21024444012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31091558400).

21024444012 is an abundant number, since it is smaller than the sum of its proper divisors (41158672788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21024444012 is a wasteful number, since it uses less digits than its factorization.

21024444012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21024444012 its reverse (21044442012), we get a palindrome (42068886024).

The spelling of 21024444012 in words is "twenty-one billion, twenty-four million, four hundred forty-four thousand, twelve".